ati 9800 pro problems

im having problems here;
i installed farcry -new beautiful bugging game of ubisoft- but it crashed. also, my other games started crashing. as i suspected a problem with my graphics card driver, i installed 4.3 cataclyst of ati, but i think i screwed up. i probably didnt remove all of the old driver. can anyone help me? how can i remove everything? i found out files of drivers are spread throughout my computer, and i dont know what i should or shouldnt remove.

uninstall the drivers you have, then get a prog called driver cleaner 3 http://www.driverheaven.net/cleaner/ follow its instructions and run it. Your pc should then be clear of old drivers and ready to install the new ones afresh. the catalyst 4.4's are out now too.